Frankly, I'm not very concerned about how dumble-correct it is. If it has about that gain range and sounds good, then I'll be happy. Very very happy.
You have to try these things for yourself, and if they work for you, then that's a major win. No one else's opinion really matters if you're getting the tones and textures you've been looking for. My Two Rock CRS V1 is as close as I'll ever need to get to a Dumble, and I generally use it very sparingly: my TR Akoya and a variety of Boogies see far more action these days. Heck, I'm more likely to use a Hiwatt PA head than the CRS.
However, it comes back to definitions: the practicalities of getting any take on a recognised Dumble circuit to work optimally, and in what will inevitably be a hostile environment, are no small thing. Quite a few so-called D-style amps and pedals can barely touch the hem of the better-known original circuits; and most of these also-rans don't begin with the compromises this multi-channel amp will inevitably require.
OTOH, if you're perfectly happy using a Synergy chassis/amp containing OS and Uberschall modules, just to pick one example, this may be an amp that you should seriously consider; and yes, I am seriously considering it myself.